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HomeHomework HelpgeologyMetamorphic Rock Textures

Metamorphic Rock Textures

Metamorphic rock textures and structures refer to the physical characteristics and arrangements of minerals within metamorphic rocks, which are formed through the alteration of pre-existing rocks under heat and pressure. These textures can include foliation, where minerals are aligned in planes, and non-foliated, where minerals are not layered, reflecting the conditions of metamorphism and the composition of the original rock.

intermediate
2 hours
Geology
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Overview

Metamorphic rocks are formed through the transformation of existing rocks under heat and pressure, resulting in unique textures and structures. Understanding these textures, such as foliation and non-foliation, is crucial for identifying metamorphic rocks and interpreting their geological history. F...

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Key Terms

Metamorphism
The process by which rocks change due to heat and pressure.

Example: Metamorphism can turn limestone into marble.

Foliation
The alignment of mineral grains in a rock, creating a layered appearance.

Example: Slate is a foliated metamorphic rock.

Non-foliated
Metamorphic rocks that do not have a layered or banded appearance.

Example: Marble is a non-foliated metamorphic rock.

Granoblastic
A texture in metamorphic rocks characterized by equidimensional grains.

Example: Quartzite exhibits granoblastic texture.

Porphyroblast
A large crystal in a metamorphic rock that forms during metamorphism.

Example: Garnet is a common porphyroblast.

Parent Rock
The original rock from which a metamorphic rock forms.

Example: Shale is the parent rock of slate.

Related Topics

Igneous Rocks
Study of rocks formed from cooled magma or lava, essential for understanding the rock cycle.
intermediate
Sedimentary Rocks
Exploration of rocks formed from sediment compaction and cementation, providing context for metamorphic processes.
intermediate
Rock Cycle
Understanding the continuous process of rock formation and transformation, linking igneous, sedimentary, and metamorphic rocks.
intermediate

Key Concepts

FoliationNon-foliatedGranoblasticPorphyroblasts